CN1604716B - Method and apparatus for a unidirectional switching, current limited cutoff circuit for an electronic ballast - Google Patents
Method and apparatus for a unidirectional switching, current limited cutoff circuit for an electronic ballast Download PDFInfo
- Publication number
- CN1604716B CN1604716B CN200410085585.8A CN200410085585A CN1604716B CN 1604716 B CN1604716 B CN 1604716B CN 200410085585 A CN200410085585 A CN 200410085585A CN 1604716 B CN1604716 B CN 1604716B
- Authority
- CN
- China
- Prior art keywords
- lamp
- circuit
- voltage
- converter circuit
- winding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/295—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/46—Circuits providing for substitution in case of failure of the lamp
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
The invention relates to a method and apparatus for a unidirectional switching, current limited cutoff circuit for an electronic ballast. A lamp inverter circuit (A) includes a switching portion that converts a bus voltage signal (11) into an alternating current signal. An input portion receives the bus voltage signal, and a resonant load portion (70, 72) drives a lamp. A preheating portion (16) heats the lamp (12) prior to ignition, and thereafter renders itself inactive following ignition of the lamp (12). A method of starting a lamp (12) includes receiving a bus voltage signal, converting the bus voltage signal into an alternating current signal, preheating the lamp (12) to an ignition temperature, igniting the lamp (12) and inactivating the preheating after the lamp has been ignited. A method of igniting an auxiliary lamp (120), including detecting a conductive state of a main lamp (12) in a lamp ballast circuit, the detecting being by a switch (94) that controls preheating of the main lamp (12). The integrity of the main lamp (12) is detected, and current flow is switched from the main lamp (12) to an auxiliary lamp (120) in the event of a main lamp failure.
Description
Technical field
The present invention relates to ballast, or be used for the power circuit of gaseous discharge lamp.The present invention is used in particular for current fed and/or start electric ballast or power circuit fast and will specifically describe with reference to these application immediately.But should be pointed out that the present invention also can be applicable to other controller, and be not limited to above-mentioned application.
Background technology
Two kinds of popular startup methods that are used for starting gaseous discharge lamp are arranged at present.A kind of is to start immediately, and another kind is quick startup.Starting and starting fast in these two kinds of methods immediately, the negative electrode of lamp is all wanted preheating before the lamp igniting.In the electric ballast that starts immediately, negative electrode is by the glow current preheating.This is the electric current that flows through lamp before the lamp igniting.Usually, the voltage of glow current is very high, can be about 400 in the 500Vrms scope or higher.At warm-up phase, lamp not conducting this moment, this high potential missionary society causes bombarding cathode, and result's some physical materials of negative electrode when lamp is lighted will sputter out.So, utilize the life-span of the lamp that starts method immediately just not as utilizing the lamp of quick start method so long.Usually, utilize life-span of the lamp start method immediately be approximately the same-type lamp that utilizes quick start method life-span 80%.
In the electric ballast that starts fast, with cathode preheat, keep the low-voltage in the lamp with voltage independent on the negative electrode simultaneously.So glow current is very little, compared with start-up circuit approximately will little 10ma immediately.Under quick Starting mode, the startup stage be added with high potential during lamp not conducting on the lamp time significantly shorten, the degree of cathode bombardment is also unlike serious with starting immediately the method, thus significant prolongation the life-span of lamp.
But utilize quick Starting mode that a shortcoming is arranged.At present, in case after adding preheat curent, described electric current is general just not to be removed from negative electrode, even after the lamp igniting.The result use as a lamp bright after, the low pressure heating current still constantly is added on the negative electrode.So utilize the lamp of quick start method startup just than consuming more power with the lamp that starts method immediately.Under a lamp situation, consume about 1.5W power possibly more, and under three lamp ballast situations, consume 4.5W possibly to 6W power more.These power that consume are heat production more, do not produce any additional light output, namely do not produce extra lumen.So, change to quick startup from starting immediately, the life-span of lamp increases but power consumption has also increased.
Summary of the invention
According to one aspect of the present invention, the lamp converter circuit comprises the conversion portion that bus voltage signal is converted to AC signal.The importation receives bus voltage signal, and resonant load partly drives lamp.Regenerator section makes pre-lamp heat before igniting, and no longer works after the lamp igniting.
According to another aspect of the present invention, the method that starts lamp comprises: receive bus voltage signal; Bus voltage signal is converted to AC signal; Lamp is preheating to firing temperature; Lamp is lighted a fire; And after the lamp igniting, stop preheating.
According to another aspect of the present invention, the ignition method of auxiliary lamp is provided, described method comprises: detect the conducting state of king light in the lamp ballast circuit, described detection is to be undertaken by the switch of controlling the king light preheating; Detect the integrality of king light; And if king light lost efficacy, then electric current is transformed into auxiliary lamp by king light.
Description of drawings
Fig. 1 is the block diagram according to lamp system of the present invention;
Fig. 2 is the circuit diagram according to the ballast converter circuit in the lamp system shown in Figure 1 of one aspect of the present invention;
Fig. 3 A illustrates according to the busbar voltage of quick startup electric ballast of the present invention on time sequencing;
Fig. 3 B illustrates according to the busbar voltage of quick startup electric ballast of the present invention and the functional relation of start-up time;
Fig. 4 illustrates the charging current with the busbar voltage variation of the capacitor 30 of Fig. 2;
Fig. 5 illustrates the another kind of structure of the part of Fig. 2 circuit, has the additional winding of tap in resonant inductor.
Embodiment
Consult Fig. 1, circuit for lamp A comprises high-frequency converter 10 and lamp assembly 12.11 power supplies of converter 10 usefulness busbar voltages can be current fed type or voltage feed-in type high-frequency converter.These two types of converters all utilize inductive circuit, no matter they are inductor or transformer.What come out from the partial inductance circuit tap of converter 10 is the additional inductor winding of winding construction 14, and described additional inductor winding is to unidirectional timing switch circuit 16 power supplies.The power that these windings provide is used for the negative electrode of preheat lamp assembly 12.Each lamp is with two windings, because each lamp has two negative electrodes to want preheating.For three modulated structures, only inductance winding construction 14 taps from converter 10 go out 4 to 6 windings, are in parallel because a negative electrode is arranged in three lamps, only with single winding heating.
The single switch of timing switch circuit 16 is chosen as has no-voltage cut-in point and zero current cut-off point.This can connect switch not having under the too high voltage.Otherwise, just need bigger, more expensive switch to finish same task.And, utilize no-voltage to connect and the zero current disconnection, when switch activated or disconnection, can reduce power consumption.Converter 10 and timing switch circuit 16 are all by current-limiting transformer structure 18 gatings, and current-limiting transformer structure 18 is regulated the electric current that starts and be provided to lamp cathode assembly 12.
Consult Fig. 2, the more detailed circuit diagram of the A of circuit for lamp shown in the figure, be included in the converter start-up circuit 10 in the current fed half-bridge converter implementation, it and negative electrode cut-off circuit are worked together, comprise inductance winding construction 14, unidirectional timing switch circuit 16 and current-limiting transformer structure 18.
For converting DC bus signal to the AC signal, alternately, phase differs from one another between conducting period and non-conduction period for the first transistor 20 and transistor seconds 22.In other words, when the first transistor conducting 20, not conducting of transistor seconds, vice versa.Transistor 20, the 22nd, the part of the switch sections of converter circuit 10.The action of the transistorized conducting period that replaces is provided to lamp assembly 12 with the AC signal.In the embodiment shown in Figure 2, transistor is bipolar junction transistor (BJT), but should be understood that concept of the present invention also can be used for other known switching network of industry.For example, but below the explanation also field-effect transistors in half-bridge current fed ballast and the current fed electric ballast of push-pull type, realize.
In described embodiment, each transistor 20,22 has base stage (B), emitter (E) and collector electrode (C) separately.Voltage on arbitrary transistor from the base stage to the emitter has been determined described transistorized conducting state.In other words, the base stage of transistor 20 has been determined the conducting state of transistor 20 to the voltage of emitter, and the base stage of transistor 22 has been determined the conducting state of transistor 22 to the voltage of emitter.In the embodiment shown, when electric current is added on the converter start-up circuit 10 at first, transistor 20 and 22 not conductings.Following will the detailed description in detail, before busbar voltage arrived predetermined threshold voltage, the actuating section 24 of converter circuit prevented that electric current is added on the transistor 20,22.Described actuating section comprises Zener diode 26, diode 28, capacitor 30 and diac 32.
The potential difference at capacitor 34 and 36 two ends equals busbar voltage.In one embodiment, capacitor 34 and 36 equivalences are so the voltage on the capacitor 34 equals the voltage on the capacitor 36.With capacitor 34 and 36 parallel connections be resistor 38,40 and 42.Resistor 38,40 forms voltage divider at node 44, and electric current is added on the actuating section 24 by voltage divider 38,40.
When power was added on the converter start-up circuit 10 at first, Zener diode 26 and diode 28 prevented that any big electric current is by actuating section 24.After power was added on the converter start-up circuit 10 at first, along with the busbar voltage straight line rises, the partial circuit electric current made capacitor 34 and 36 chargings, and other electric current makes resonant capacitor 46 chargings, remaining current flows through resistor 38,40 and 42.At first, because half busbar voltage by resistor 38 and 40 dividing potential drops, can not reach the puncture voltage of Zener diode 26, Zener diode 26 prevents that electric current from flowing through actuating section 24.Finally, busbar voltage rises to the current potential that makes node 44 greater than the level of Zener diode 26 puncture voltages, makes Zener diode 26 conductings, and the current level that increases is added to actuating section 24, more particularly, is added on the capacitor 30.In the embodiment shown, the puncture voltage of Zener diode 26 between about 60 to 80 volts, preferably 80 volts.
In case Zener diode 26 conductings (among Fig. 2 from left to right), capacitor 30 begin charging.At this moment, electric current is added on the actuating section 24, but diac 32 prevents the conducting of base stage on collector electrode-emitter direction of transistor 20.Along with busbar voltage continues to rise, capacitor 30 has gathered more electric charge, finally arrives the current potential that Danone surpasses diac 32 conducting voltage.When arriving conducting voltage, transistor 20 conductings, converter start-up circuit 12 starting oscillations are with the cathode preheat of lamp assembly 12.
Arrive after the conducting voltage of diac 32, capacitor 30 no longer includes chance and continues to gather electric charge.Electric current directly flows to the collector electrode of transistor 20 from node 44, because transistor 20 conductings after diac 32 conductings.Diode 28 provides a path, allows capacitor 30 discharges, and the phase once weekly.Converter start-up circuit 10 existing operate as normal, actuating section 24 no longer includes action.
Continue to consult Fig. 2, switching transistor 20,22 is driven by separately drive circuit 48,50.Drive circuit 48 comprises the combination of diode 52 and resistor 54, by winding 56,68 coupling power supply.Drive circuit 50 comprises the combination of diode 60 and resistor 62, by winding 64,68 coupling power supply.Lamp assembly 12 is powered from converter circuit 10 by the coupling of winding 68 and 70, and wherein winding 70 has capacitor 72 at its length two ends, can regard winding 70 and capacitor 72 as the resonant load element.Winding 58 and 66 is also as current-limiting apparatus.
If load changes suddenly, power Zener diode 74 and 76 punctures, and the current potential at nip transistor (for example BJT) two ends protects them not to be destroyed.
Continue to consult Fig. 2, the conducting voltage of diac 32 is chosen as with the optimum igniting voltage of lamp assembly 12 and is directly proportional.In the embodiment shown, the conducting voltage of diac 32 is chosen as: when busbar voltage (voltage on the capacitor 34 and 36) arrived predetermined value, for example about 390 volts the time, diac 32 arrived its conducting voltage.In other words, actuating section 24 detects busbar voltage according to the selected conducting voltage of Zener diode 26 and diac 32 and when arrives preferred ignition voltage.In the embodiment shown, the conducting voltage of diac 32 between 20 volts and 40 volts, preferably about 32 volts.
Should be understood that above-mentioned explanation for the first transistor 20 also is applicable to transistor seconds 22.In other words, in the embodiment of another converter start-up circuit, actuating section 24 is connected to transistor seconds 22, starts vibration by transistor seconds 22, rather than by the first transistor 20.
And the preferred point ignition voltage may be selected to be to be lower than and is starting and the exemplary operation voltage (in some instances, being respectively about 450V and 500V) that starts lamp in the application fast immediately.Ignition voltage also is chosen as about 300 volts or higher.
Fig. 3 A illustrates the time series chart of the quick startup ballast that comprises converter start-up circuit 10 of the present invention.As seen from the figure, this sequence comprises three different transformations.From connecting (0) to t
0Busbar voltage is converted to preferred pre-thermal voltage (for example 390V) from starting voltage (for example 169V).t
0-t
1Duration be warm-up time (for example stable 390V), from t
1To t
2, busbar voltage rises to its stable state (for example 500V).Consult Fig. 3 B, explanation shown in the figure comprises the curve chart of converter start-up time of the quick startup ballast of converter start-up circuit 10.Watch Fig. 3 A and 3B simultaneously, controlled by the busbar voltage of circuit start-up time as can be known.For example, if busbar voltage less than 300V, converter circuit will start with about 10 seconds, but when busbar voltage be 300V or when higher, drop to about 40 milliseconds start-up time.Fig. 3 B illustrates the voltage-dependent of circuit, and the work of start-up circuit is not a factor that relies on the time as can be seen, but one is subjected to voltage-controlled concept.Behind power supply and starting oscillation, there is not predetermined time.But in the design, behind circuit supply, as long as busbar voltage is lower than a certain numerical value (for example 300V), ideally just not vibration is only worked as busbar voltage and is equal to or higher than conducting voltage (for example 300V), and vibration just can begin.The startup that this shows circuit is subjected to the control of bus voltage value.
Now consult Fig. 4, the work of the charging capacitor 30 of Fig. 2 shown in the figure illustrates its two kinds of different charge rates.Charging capacitor 30 has a certain amount of storage power to be used for conducting diac 32 all the time.As shown in the figure, when busbar voltage surpassed 300V, capacitor 30 was with very fast speed charging, and when busbar voltage was lower than 300V, capacitor 30 was only charged by leakage current.Specifically, when busbar voltage was lower than 300V, Zener diode 26 is conducting in the opposite direction anything but, only allowed leakage current 73a to come charging capacitor 30.When busbar voltage reached 300V, significantly higher charging current 73b just can be added on the capacitor 30.
Another factor that will consider is to start busbar voltage when selecting threshold voltage.For the circuit input of 120V, the busbar voltage of output rises from about 169V.For the circuit input of 277V, the busbar voltage of output rises from about 390V.As previously mentioned, be approximately 40 milliseconds start-up time when 390V.After the converter current vibration, busbar voltage continues to rise to steady state working voltage V.So a kind of demonstration pilot project ignition voltage is 390V, because it changes required 300V greater than mode, and less than common steady state working voltage, and before busbar voltage arrives stable state, can trigger converter circuit as early as possible.Certainly, can select higher or lower ignition voltage according to known line voltage and required converter universality.
Get back to Fig. 2, please note that negative electrode ends or pre-thermal control circuit (14,16,18).In this design, winding 70 and 68 except designing as the resonant inductance, also provides the isolation to ballast.The secondary inductance winding 80 of winding construction 14 has improved the voltage of switching circuit 16 and isolation to switching circuit 16 is provided.Resonance winding 70 comprises a gap, has quite low magnetizing inductance device.This inductor is as resonant element, before lamp starts with capacitor 72 and 46 resonance.In addition, after the lamp igniting in lamp assembly 12, capacitor 75,77 and 78 is reflected to primary side 70.Winding 70 is determined one or more operating frequencies of assembly A together in conjunction with capacitor 46,72,75,77 and 78.
Inductor winding 80 is also from 70 taps of resonant inductor winding.Winding 80 is to elementary winding 82 power supplies of switching circuit.Winding 82 is again to negative electrode winding 84,86,88 and 90 power supplies.The negative electrode of lamp in negative electrode winding 84,86, the 88 and 90 preheat lamp assemblies 12.Should be understood that negative electrode winding 84,86,88 and 90 is used as the secondary of elementary winding 82.Described elementary winding has the more number of turn, so the electric current that needs in elementary winding 82 is just lower.Otherwise, just need make switching device 94 with the expensive device that can hold high current.The device of low current also is more satisfactory for reducing power consumption.Capacitor 92 has limited the electric current that winding 80 provides to elementary winding 82.If the value of capacitor 92 is selected enough lowly, it can limit the maximum current that is provided on the winding 82.Capacitor 92 serves a dual purpose: it plays blocking capacitor when transistor 94 is not worked.After several cycles, it removes winding 82 from circuit.That is, when transistor 94 is not worked, not target heating.Diode 96 is connected between capacitor 34 and 36, and protective transistor 94 can not be added with excessive voltage between transient period when transistor 94 is not worked.
The winding construction 14 of Fig. 1 also comprises inductor winding 98, and it provides electric current by diode 100 and makes capacitor 102 chargings.Capacitor 102 is subjected to be controlled by capacitor 106 and resistor 104 determined RC time constants.Described time constant is chosen as behind safety time of lamp assembly igniting from negative electrode cancellation heating, for example can be in converter current igniting back several seconds to 10 second or more.Capacitor 102 is connected to the grid of FET108 via resistor 104.When satisfying by the determined RC time constant of capacitor 106 and resistor 104, the electric charge that gathers at capacitor 102 makes the FET108 conducting.The grid of FET94 drops to lower voltage level then, and FET94 is quit work.As previously mentioned, when FET94 did not work, the voltage in the circuit 16 on the cathode switch was removed, thereby had cancelled anticathode heating.
Now consult Fig. 5, shown in the figure is another negative electrode cut-off circuit 14 ', 16 ', the 18 ' embodiment with part that the half-bridge voltage feed-in starts electronic converter 10 ' fast.Converter 10 ' uses FET switch 20 ', 22 '.This design comprises the additional winding 110 of the tap that belongs to resonant inductor 112.Power is transported to negative electrode 114,116 via capacitor 92 and elementary winding 82 from the winding 110 of resonant inductor 112, and the element and the element among Fig. 2 that have similar functions with element among Fig. 2 have identical numbering.
Therefore, according to above, can see that Fig. 2 and 5 illustrates two kinds of embodiments of the new start-up circuit that combines with the half-bridge converter circuit of curtage feed-in, described circuit also realizes adopting the negative electrode cut-off circuit of single-way switch current design.Main bus bar voltage can be detected by three resistor bleeder circuits.The part busbar voltage is added on Zener diode and the charging capacitor.When voltage reached predetermined level, Zener diode punctured, and allowed the charging capacitor charging.Diac punctures then, causes the self-oscillation converter to be triggered.When the first transistor was connected, diode prevented that charging capacitor is recharged, and allowed it to discharge at every half cycle.Select component value like this, make that the puncture voltage of Zener diode is the twice of diac puncture voltage or higher at least.The single-way switch circuit is being controlled the energy that is transported on the lamp cathode, and limiting capacitor prevents that electric current is elevated to dangerous degree.This for example during one or more negative electrode short circuit, can protect described structure when possible false wiring.Before the vibration of converter transistor 20 (20 ') and 22 (22 '), single unidirectional transistor switch 94 is connected under the no-voltage situation, when the parasitic inverse parallel diode of FET (or with BJT diode connected in parallel) conducting, disconnects under the situation of zero current.Started and stablized 108 controls of back transistor at lamp negative electrode has been added heat abstraction.Of the present inventionly may use 4ft. and 8ft.T12 and the T8 electronic lamp ballast that comprises General Electric Co. Limited.
The additional embodiment of above-mentioned design can be used for king light starts auxiliary power circuit when extinguishing.For example, consult Fig. 1, when king light (for example lamp of assembly 12) lost efficacy or when not being used the heater circuit (14,16,18) that is illustrated by the broken lines can be used to provide accessory power supply.In this case, auxiliary lamp 120 can be connected to preheat circuit (14,16,18).Auxiliary lamp can be lower powered fluorescent lamp, incandescent lamp or other light-emitting component.So additional winding 14,18 is not the negative electrode of preheat lamp assembly 12, they are connected to auxiliary lamp 120.Carry out winding coupled by the mode of discussing in conjunction with Fig. 2 and Fig. 5 (for example winding 82), just can realize this connection, provide power supply and control to auxiliary lamp, or power and control auxiliary lamp with independent converter circuit.This design provides very cheap floor light control, in part because use single switch to replace the biswitch system.Auxiliary lamp can be used for various situations, for example standby lighting or Emergency Light situation.Like this, preheat circuit (14,16,18) can be used for to auxiliary lamp 120 power supplies, rather than heated cathode.
Some exemplary components values of circuit are as follows among Fig. 2 and Fig. 5:
| Part name lamp assembly line voltage the first transistor transistor seconds | Number 10 11 20 22 | Rated value 40W 120-277V BJT SPB 11 NM60 BJT SPB 11 NM60 |
| Bus capacitor bus capacitor bus resistor bus resistor bus resistor diode capacitor charging capacitor diac Zener diode base diode base diode base resistor base resistor inductance winding inductance winding inductance winding inductance winding electric container Zener diode capacitor Zener diode capacitor electrode container winding primary cathode winding secondary cathode winding secondary cathode winding | ?34?36?38?40?42?28?46?30?32?76?52?60?54?62?58?66?70?68?72?74?75?26?77?78?80?82?84?86 | ?33μf?33μf?400kΩ?620kΩ?1MΩ?UF4007?1.2nf?0.1μf?HT-32?P6KE440A?1N5817?1N5817?75Ω?75Ω?5mH?5mH?0.85mH?1.27mH?0.01μf?P6KE440A?0.056μf?68V?0.0056μf?0.0056μf?0.47mh?1mh?2μh?2μh |
| Secondary cathode winding secondary cathode winding electric container | ?88?90?92 | 2μh2μh4.7nf |
Should be understood that said elements and numerical value can change according to specific embodiments, Unlisted numerical value can be selected according to these embodiments.
The invention has been described in conjunction with the preferred embodiments.Read with understood more than detailed description after other people can expect some modifications and replacement.Should think to the present invention includes all such modifications and replacement, because they are within the scope of appended claims or its equivalent.
Claims (7)
1. lamp converter circuit, it comprises:
Conversion portion, it converts bus voltage signal to AC signal;
The importation, it receives described bus voltage signal;
The resonant load part is used for driving lamp; And
The cathode preheat part, it carries out following operation:
The described lamp of heating before described lamp igniting, and
After described lamp igniting, quit work automatically,
Wherein said cathode preheat partly comprises the single-way switch of supplying with the energy of at least one lamp for control, described single-way switch receives AC controling signal, and be unidirectional, in order to avoid before being controlled by described single-way switch, need to convert this AC controling signal to the pulsating direct current signal.
2. lamp converter circuit as claimed in claim 1, wherein said converter circuit is one of voltage feed-in circuit or current fed circuit.
3. lamp converter circuit as claimed in claim 1, wherein said single-way switch is field-effect transistor.
4. lamp converter circuit as claimed in claim 1, wherein said single-way switch is bipolar junction transistor.
5. lamp converter circuit as claimed in claim 1, wherein said single-way switch has the no-voltage cut-in point.
6. lamp converter circuit as claimed in claim 1, wherein said single-way switch has the zero current cut-off point.
7. lamp converter circuit as claimed in claim 1, wherein said cathode preheat part comprise that also second switch, described second switch control the disconnection of described cathode preheat part.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/675441 | 2003-09-30 | ||
| US10/675,441 US6936970B2 (en) | 2003-09-30 | 2003-09-30 | Method and apparatus for a unidirectional switching, current limited cutoff circuit for an electronic ballast |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1604716A CN1604716A (en) | 2005-04-06 |
| CN1604716B true CN1604716B (en) | 2013-09-04 |
Family
ID=34313988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200410085585.8A Expired - Fee Related CN1604716B (en) | 2003-09-30 | 2004-09-30 | Method and apparatus for a unidirectional switching, current limited cutoff circuit for an electronic ballast |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US6936970B2 (en) |
| EP (1) | EP1521508A1 (en) |
| CN (1) | CN1604716B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7420336B2 (en) * | 2004-12-30 | 2008-09-02 | General Electric Company | Method of controlling cathode voltage with low lamp's arc current |
| US7573204B2 (en) * | 2006-12-29 | 2009-08-11 | General Electric Company | Standby lighting for lamp ballasts |
| US7733028B2 (en) * | 2007-11-05 | 2010-06-08 | General Electric Company | Method and system for eliminating DC bias on electrolytic capacitors and shutdown detecting circuit for current fed ballast |
| US7839094B2 (en) * | 2008-05-02 | 2010-11-23 | General Electric Company | Voltage fed programmed start ballast |
| CA2727529A1 (en) | 2008-06-13 | 2009-12-17 | Queen's University At Kingston | Dimmable single stage electronic ballast with high power factor |
| US8779674B2 (en) | 2009-08-21 | 2014-07-15 | John Lam | Electronic ballast with high power factor |
| US8922131B1 (en) | 2011-10-10 | 2014-12-30 | Universal Lighting Technologies, Inc. | Series resonant inverter with capacitive power compensation for multiple lamp parallel operation |
Family Cites Families (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3841227A1 (en) | 1988-12-07 | 1990-06-13 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | CIRCUIT ARRANGEMENT FOR OPERATING A LOW-PRESSURE DISCHARGE LAMP |
| DE4121009C2 (en) * | 1991-06-21 | 1994-01-13 | Prolux Maschinenbau Gmbh | Circuit arrangement for operating a discharge lamp |
| US5796216A (en) | 1993-07-16 | 1998-08-18 | Delta Power Supply, Inc. | Electronic ignition enhancing circuit having both fundamental and harmonic resonant circuits as well as a DC offset |
| JPH07235564A (en) * | 1993-12-27 | 1995-09-05 | Toshiba Corp | Semiconductor device |
| JP3329929B2 (en) * | 1994-02-15 | 2002-09-30 | 松下電工株式会社 | High pressure discharge lamp lighting device |
| DE4410492A1 (en) | 1994-03-25 | 1995-09-28 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Circuit arrangement for operating low-pressure discharge lamps |
| US5623187A (en) | 1994-12-28 | 1997-04-22 | Philips Electronics North America Corporation | Controller for a gas discharge lamp with variable inverter frequency and with lamp power and bus voltage control |
| US5569984A (en) | 1994-12-28 | 1996-10-29 | Philips Electronics North America Corporation | Method and controller for detecting arc instabilities in gas discharge lamps |
| US5723953A (en) * | 1996-09-19 | 1998-03-03 | General Electric Company | High voltage IC-driven half-bridge gas discharge lamp ballast |
| US6011362A (en) | 1996-11-19 | 2000-01-04 | Electro-Mag International, Inc. | Magnetic ballast adaptor circuit |
| US5932976A (en) | 1997-01-14 | 1999-08-03 | Matsushita Electric Works R&D Laboratory, Inc. | Discharge lamp driving |
| US6034489A (en) | 1997-12-04 | 2000-03-07 | Matsushita Electric Works R&D Laboratory, Inc. | Electronic ballast circuit |
| EP0986936A1 (en) | 1998-04-02 | 2000-03-22 | Koninklijke Philips Electronics N.V. | Circuit arrangement |
| EP0986937A1 (en) * | 1998-04-02 | 2000-03-22 | Koninklijke Philips Electronics N.V. | Circuit arrangement |
| US6495971B1 (en) | 1998-06-13 | 2002-12-17 | Hatch Transformers, Inc. | High intensity discharge lamp ballast |
| US6184630B1 (en) | 1999-02-08 | 2001-02-06 | Philips Electronics North America Corporation | Electronic lamp ballast with voltage source power feedback to AC-side |
| US6020691A (en) | 1999-04-30 | 2000-02-01 | Matsushita Electric Works R & D Laboratory, Inc. | Driving circuit for high intensity discharge lamp electronic ballast |
| DE19923238A1 (en) | 1999-05-20 | 2001-01-11 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Circuit for correcting the power factor |
| US6337800B1 (en) | 2000-02-29 | 2002-01-08 | Philips Electronics North American Corporation | Electronic ballast with inductive power feedback |
| US6483252B2 (en) | 2000-12-08 | 2002-11-19 | Koninklijke Philips Electronics N.V. | Optimal FM for HF operation of high intensity discharge (HID) lamps |
| US6417631B1 (en) | 2001-02-07 | 2002-07-09 | General Electric Company | Integrated bridge inverter circuit for discharge lighting |
| US6803730B2 (en) | 2001-03-21 | 2004-10-12 | International Rectifier Corporation | Single stage PFC + ballast control circuit/general purpose power converter |
| US6593703B2 (en) * | 2001-06-15 | 2003-07-15 | Matsushita Electric Works, Ltd. | Apparatus and method for driving a high intensity discharge lamp |
| US6501225B1 (en) * | 2001-08-06 | 2002-12-31 | Osram Sylvania Inc. | Ballast with efficient filament preheating and lamp fault protection |
-
2003
- 2003-09-30 US US10/675,441 patent/US6936970B2/en not_active Expired - Fee Related
-
2004
- 2004-09-29 EP EP04255956A patent/EP1521508A1/en not_active Ceased
- 2004-09-30 CN CN200410085585.8A patent/CN1604716B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP1521508A1 (en) | 2005-04-06 |
| CN1604716A (en) | 2005-04-06 |
| US20050067967A1 (en) | 2005-03-31 |
| US6936970B2 (en) | 2005-08-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6023132A (en) | Electronic ballast deriving auxilliary power from lamp output | |
| US6037722A (en) | Dimmable ballast apparatus and method for controlling power delivered to a fluorescent lamp | |
| US20070152598A1 (en) | Method for increasing profit in a business to maintain lighting operations in an office building or other place of business | |
| EP1987705B1 (en) | Voltage fed inverter for fluorescent lamps | |
| US9013106B2 (en) | Lamp ballast having filament heating apparatus for gas discharge lamp | |
| CA2482665A1 (en) | Method for operating at least one low-pressure discharge lamp | |
| CN102077694A (en) | Ballast with lamp-diagnostic filament heating, and method therefor | |
| JPH10512395A (en) | Multifunctional filament heater power supply for electronic ballast for long life dimmable lamps | |
| US8084949B2 (en) | Fluorescent ballast with inherent end-of-life protection | |
| CN103959915A (en) | Starting circuit for buck converter | |
| CN1604716B (en) | Method and apparatus for a unidirectional switching, current limited cutoff circuit for an electronic ballast | |
| US5194781A (en) | Control circuit | |
| WO2000045622A1 (en) | Hid ballast with hot restart circuit | |
| US7733028B2 (en) | Method and system for eliminating DC bias on electrolytic capacitors and shutdown detecting circuit for current fed ballast | |
| US20050035730A1 (en) | Distributed fluorescent light control system | |
| EP0581912B1 (en) | Improved low loss ballast system | |
| GB2261332A (en) | Driving circuits for discharge devices | |
| US6989637B2 (en) | Method and apparatus for a voltage controlled start-up circuit for an electronic ballast | |
| US6437520B1 (en) | Electronic ballast with cross-coupled outputs | |
| US7733031B2 (en) | Starting fluorescent lamps with a voltage fed inverter | |
| CA2478464A1 (en) | Ballast with inverter startup circuit | |
| JP2000294391A (en) | Dc lighting device for fluorescent lamp | |
| US7573204B2 (en) | Standby lighting for lamp ballasts | |
| WO2013082746A1 (en) | Step-dimming solution for lamp ballast | |
| JPH09238480A (en) | Power supply equipment, discharge lamp lighting device and luminaire |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130904 Termination date: 20140930 |
|
| EXPY | Termination of patent right or utility model |